If you want to keep using Cookies, you could increase the max_header_value_length and max_request_line_length for cowboy_http, e.g:
config :my_app, MyAppWeb.Endpoint,
http: [
protocol_options: [
max_request_line_length: @req_line_length,
max_header_value_length: @header_value_length
]
]
If you want sharing between servers, maybe take a look at mnesia. Not an expert there, put it has support for clustering.
